Parts for your 2008 Holden Barina-Throttle position sensors

2008 Holden Barina throttle-position sensor (TPS): what it does and how to look after it

Based on Holden/GM service information for the TK Barina (2005–2011 Engine Controls), Autodata engine management data for the F14D3/F16D3 E‑TEC II petrol engines, and common OBD‑II diagnostics for this model (DTCs P0121–P0123), the 2008 Holden Barina is fitted with a throttle-position sensor. On this Barina the throttle is cable-operated, and the TPS is a potentiometer mounted on the throttle body, used by the Delphi/GM ECM to track throttle angle. It’s a relevant, serviceable part on these cars.

On the 2008 Barina, the TPS tells the engine computer exactly how far the driver’s pressed the pedal. The ECM then fine‑tunes fuel, ignition timing and idle control, and it also helps manage auto transmission shift timing where fitted. A healthy TPS means crisp throttle response, smoother gear changes, and decent fuel economy around town.

Owners will usually find the TPS on the side of the throttle body under the bonnet, opposite the cable quadrant. It shares the housing with the idle air control valve on many TK units. If the TPS signal gets noisy or drifts, the Barina can feel hesitant off the line, surge at steady speeds, or idle rough. The check engine light often joins in with codes like P0121 (range/performance), P0122 (low input) or P0123 (high input) referenced in GM/Daewoo service docs.

• Common symptoms: flat spots, erratic idle, higher fuel use, harsh shifts (auto), and a lit MIL.
• Quick checks: inspect the connector for green corrosion, make sure the throttle plate and bore are clean, and verify smooth voltage sweep (about 0.4–0.7 V closed to ~4.5 V wide open) with no dropouts.

Replacement is straightforward: disconnect the battery as a safety habit, unplug the connector, and swap the sensor, taking care not to twist the throttle shaft. Use a quality OEM‑equivalent part and snug the screws evenly—no gorilla torque. Most TK Barinas don’t need coding for a new TPS, but an idle learn helps: warm the engine, let it idle a few minutes, switch off briefly, then drive a normal cycle so the ECM relearns. As part of routine servicing, cleaning the throttle body, checking the TPS plug and harness strain relief, and scanning for stored codes will keep the Barina behaving nicely between WOF/rego checks.

FAQs

Does the 2008 Holden Barina use drive-by-wire?
No. The 2008 TK Barina uses a cable-operated throttle with a throttle-position sensor and an idle air control valve. The TPS reports throttle angle to the ECM, but the blade itself is moved by the cable from the pedal.

What are the signs the TPS is failing on a 2008 Barina?
Owners often notice hesitation off idle, random surging at a steady cruise, a rough or hunting idle, higher fuel use, or harsh/odd shifting in autos. The check engine light commonly appears with codes like P0121, P0122 or P0123. A smooth voltage sweep test at the sensor is the tell-tale.

Do new TPS units need programming on this model?
Generally, no coding is required on the TK Barina. Fit the sensor, clear any codes, and perform an idle learn. A short drive mix (idle, light throttle, then normal cruising) helps the ECM settle its trims.